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Gross Anatomy > Thorax, Abdominal, Pelvis > Flashcards

Thorax, Abdominal, Pelvis Flashcards

1
Q

Rectus Abdominus

A

O: Internal- Crest of pubis to pubic tubercle
Medial- Anterior region of pubic symphysis
I: Cartilages 5th- 7th ribs, Xiphoid process of sternum
Inn: Intercostal n. (T5-T12)
A: Stabilizes pelvis, flexes trunk, compresses abdomin

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2
Q

External Oblique

A

O: 5th-12th ribs (outer surface)
I: linea alba, pubic tubercle, anterior iliac crest
Inn: Intercostal n. (T7-T12)
A: Unilaterally- Contralateral trunk rotation, ipsalateral trunk flexion
BIlaterally- flexes trunk

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3
Q

Internal Oblique

A

O: Thoracolumbar fascia, ASIS, iliopsoas fascia, iliac crest
I: 10th-12th ribs (lower borders), linea alba
Inn: intercostal n. (T7-T12), iliohypogastric n., ilioinguinal n.
A: Contralateral trunk rotation, flexes trunk

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4
Q

Transverse Abdominus

A

O: 7th-12th costal cartilage, ASIS, Thorocolumbar fascia, iliac crest
I: linea alba, pubic crest
Inn: intercostal n. (T7-T12), iliohypogastric n., ilioinguinal n.
A: Unil- ipsalateral rotation; bil- compresses abdomen

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5
Q

Transverse Thoracis

A

O: inner surface of sternum and xiphoid process
I: inner surface costal cartilage 2-6th ribs
Inn: 2nd-6th intercostal n.
A: weakly lowers ribs (expiration)

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6
Q

Innermost Intercostal

A

O: Lower margin of rib to upper margin of next lower rib, (costal angle to sternum)
I: same as origin
Inn: 1st-11th intercostal n.
A: lowers ribs, stabilizes chest wall, supports intercostal spaces

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7
Q

Internal Intercostal

A

O: lower margin of rib-upper margin of next lower rib (costal angle to sternum)
I: same as origin
Inn: 1st-11th intercostal n.
A: lowers ribs, stabilizes chest wall, supports intercostal spaces

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8
Q

External Intercostal

A

O: Lower margin of rib-upper margin of next lower rib (costal tubercle to interosseous junction)
I: same as origin
Inn: 1st-11th intercostal n.
A: Raises ribs, supports intercostal space, stabilizes chest wall

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9
Q

Diaphragm (costal, lumbar, sternal parts)

A

O: Costal- inner surface of 7th-12th ribs
Lumbar- medial L1-L3 vertebral bodies, intervertebral discs. Lateral- lateral and medial arcuate ligament.
Sternal- posterior surface of xiphoid process
I: central tendon
Inn: phrenic n (C3-C5)
A: Principle muscle or respiration. Aids in compressing abdominal viscera.

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10
Q

Psoas Major

A

O: Superficial- T12-L4 vertebral bodies and IV discs
Deep- L1-L5 costal process
I: Lesser trochanter
Inn: Direct branches from lumbar plexus (L2-L4)
A: Unil- lateral flexion
Bil- trunk flexion

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11
Q

Psoas Minor

A

O: T12,L1 vertebrae
I: Lesser trochanter
Inn: direct branches from lumbar plexus (L2-L4)
A: Weak trunk flexor

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12
Q

Quadratus Lumborum

A 
O: iliac crest, iliolumbar ligament
I: lesser trochanter
Inn: T12, L1-L4 spinal n. 
A: Unil- lateral flexion
     Bil- expirtaion stabilizes 12th ribs
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13
Q

Iliacus

A

O: iliac fossa
I: lesser trochanter
Inn: femoral n. (L2-L4)
A: Flexes thigh and stabilizes hip joint

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14
Q

Obturtor Internus

A

O: Obturator membrane
I: greater trochanter on femur
Inn: direct branches of sacral plexus (L5-S1)
A: External rotation, Abd of flexed hip

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15
Q

Piriformis

A

O: Pelvic surface of sacrum
I: greater trochanter of femur
Inn: direct branches from sacral plexus (S1-S2)
A: External rotation, Abd of flexed hip

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16
Q

Coccygeus

A

O: Inferior end of sacrum
I: Ischial spine
Inn: Direct branches sacral plexus (S4-S5)
A: Supports pelvic viscera, flexes coccyx

17
Q

Levator ani

A

O: Superior pubic ramus, pubis, internal obturator, fascia of levator ani
I: anoccygeus ligament
Inn: direct branches of sacral plexus (S4)
A: Pelvic Diaphragm, supports pelvic viscera

18
Q

Ischiocavernosus

A

O: ischial ramus
I: crus of clitoris/ penis
Inn: pundendal n. (S2-S4)
A: Maintains erection by squeezing blood into corpus cavernosum

19
Q

Bulbospongiosus

A 
O: runs anteriorly from peritoneal body to clitoris (female)/ penile raphe (males)
I: Same as origin
Inn: pudendal n. (S2-S4)
A: Female- compresses restibular gland
     Male- assists in erection
20
Q

Superficial Transverse Perineal

A

O: Ischial ramus
I: perineal body
Inn: pudendal n. (S2-S4)
A: closes urethra, holds organs in place

21
Q

External Anal Sphincter

A

O: Encircles anus
I: same as origin
Inn: pudendal n. (S2-S4)
A: closes anus

Gross Anatomy (7 decks)

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